Incidence for everything on the plane should be zero. It's not uncommon to have to adjust the stab incidences a little. The set screws for the stabs will hold it all in place once you have the incidence correct, if it needs adjusted. Most never take the stabs off once they have been installed, so it's no big deal. Use the top edges of the canopy hatch opening for an incidence reference. Look at it this way, you won't have to open up the holes to adjust the incidence. Look at all the time and work you saved.

If the gap doesn't want to go away, it still won't hurt the flight traits at all. Check the stab tube again, though, I had to shorten two of mine about 1/4" too.